mysterious

Name: mysterious, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

/mɪˈstɪə̯.ɹi.əs/

//mɪˈstɪə̯.ɹi.əs// adj

By PlainSpell Editorial Team · According to Wiktionary data (CC BY-SA) · analyzed May 6, 2026

The verdict

“mysterious” is a regularly-used English word, ranked #5,440 in English word frequency and used as an adjective.

#5,440
frequency rank, English: 10
letters: 15
tracked misspellings: 2
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Of unknown origin.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

mysterious vs mysteriously

83% similar

mysterious vs mysteries

80% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for mysterious
Property	Value
Headword	mysterious
Language	English
Part of speech	Adjective
IPA	/mɪˈstɪə̯.ɹi.əs/
Letters	10
Frequency rank	#5,440
Misspellings tracked	15
Confusable pairs	2
Source	Wiktionary (kaikki.org)

Where “mysterious” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). mysterious lands here:

#5,440

#1#100#1K#10K#100K

← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for mysterious is 10 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /mɪˈstɪə̯.ɹi.əs/. Corpus data places it at rank #5,440 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 15 likely wrong-spelling variants for mysterious, with forms such as "mmysterious", "msyterious", and "mysetrious". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 2 confusable-pair relationships, "mysteriously", "mysteries", a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Middle English *misterius (implied in misteriusly), probably partly from Middle French mystérieux and partly from Latin mystērium + -ous. By surface analysis, mystery + -ous. The correct English form is mysterious, spelled M-Y-S-T-E-R-I-O-U-S.

Definition

1
Of unknown origin.
2
Having unknown qualities.
3
Difficult to understand.
4
Deliberately evasive or enigmatic.

Etymology

From Middle English *misterius (implied in misteriusly), probably partly from Middle French mystérieux and partly from Latin mystērium + -ous. By surface analysis, mystery + -ous.

Synonyms

arcane cryptic enigmatic ill-defined inenubilablemysterialmysterioso mysterious mystic runish sibyllinesysteriousuncertain undefined undetermined

Antonyms

known unambiguous unmysterious well-defined

This word in other languages

misterioso(Español)mystérieux(Français)mysteriös(Deutsch)misterioso(Português)

Common misspellings

Also misspelled as: mmysterious,msyterious,mysetrious,myssterious,mysteirous,mysteriosu,mysteriouss,mysteriuos,mysteroius,mysterrious,mystreious,mystterious,mytserious,myysterious,ymsterious

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of mysterious - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

Edit distance from "mysterious"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "mysterious"?

"mysterious" is spelled M-Y-S-T-E-R-I-O-U-S. The IPA pronunciation is /mɪˈstɪə̯.ɹi.əs/.

What does "mysterious" mean?

As an adjective, "mysterious" means: Of unknown origin.

What words are commonly confused with "mysterious"?

"mysterious" is commonly confused with "mysteriously", "mysteries". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.

How do you pronounce "mysterious"?

The IPA (International Phonetic Alphabet) transcription for "mysterious" is /mɪˈstɪə̯.ɹi.əs/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.

What is the origin of the word "mysterious"?

From Middle English *misterius (implied in misteriusly), probably partly from Middle French mystérieux and partly from Latin mystērium + -ous. By surface analysis, mystery + -ous. See the full etymology section above for more details.

Is PlainSpell free to use?

Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “mysterious”

The practical upshot for anyone who landed here from a spell-check.

The one correct English spelling is M-Y-S-T-E-R-I-O-U-S - every other letter order is a misspelling in standard orthography.
Say it as /mɪˈstɪə̯.ɹi.əs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
Don't mix it up with “mysteriously” - see the side-by-side comparison. mysterious vs mysteriously
Browse more English words and confusable pairs in the same reference. English words

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.